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Income Taxes - Schedule of Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other Tax Carryforward [Line Items]      
Effective tax rate (as a percent) 16.00% 16.00% 25.00%
Income tax reconciliation [Abstract]      
Income before income taxes $ 1,214 $ 1,087 $ 1,417
Federal statutory income tax rate 21.00% 21.00% 21.00%
Expected federal income tax expense $ 255 $ 228 $ 298
Increase (decrease) in tax expense resulting from:      
State income tax expense, net of federal income tax 25 25 46
State valuation allowance, net of federal income tax 17 0 0
State law change, net of federal income tax (47) (69) 0
Equity AFUDC (12) (13) (8)
Excess deferred income tax amortization (43) (44) (51)
Goodwill impairment 0 0 84
Sale of Energy Systems Group 0 28 0
Other, net 0 15 (9)
Total (60) (58) 62
Total income tax expense (benefit) $ 195 $ 170 $ 360
Effective tax rate (as a percent) 16.00% 16.00% 25.00%
Net income      
Increase (decrease) in tax expense resulting from:      
Equity AFUDC $ (13) $ (8)  
Excess deferred income tax amortization (44) (51)  
Goodwill impairment   $ 84  
Sale of Energy Systems Group 28    
Income tax rate reconciliation, state deferred remeasurement, net of federal income tax $ 69    
Houston Electric      
Other Tax Carryforward [Line Items]      
Effective tax rate (as a percent) 20.00% 22.00% 20.00%
Income tax reconciliation [Abstract]      
Income before income taxes $ 684 $ 761 $ 635
Federal statutory income tax rate 21.00% 21.00% 21.00%
Expected federal income tax expense $ 144 $ 160 $ 133
Increase (decrease) in tax expense resulting from:      
State income tax expense, net of federal income tax 12 27 13
Equity AFUDC (5) 0 0
Excess deferred income tax amortization (17) (17) (18)
Other, net 4 (2) (3)
Total (6) 8 (8)
Total income tax expense (benefit) $ 138 $ 168 $ 125
Effective tax rate (as a percent) 20.00% 22.00% 20.00%
CERC      
Other Tax Carryforward [Line Items]      
Effective tax rate (as a percent) 16.00% (5.00%) 25.00%
Income tax reconciliation [Abstract]      
Income before income taxes $ 644 $ 486 $ 961
Federal statutory income tax rate 21.00% 21.00% 21.00%
Expected federal income tax expense $ 135 $ 102 $ 202
Increase (decrease) in tax expense resulting from:      
State income tax expense, net of federal income tax 19 (40) 35
State law change, net of federal income tax (45) (66) 0
Equity AFUDC (4) 0 0
Excess deferred income tax amortization (15) (23) (28)
Goodwill impairment 0 0 30
Other, net (3) 1 (3)
Total (31) (128) 34
Total income tax expense (benefit) $ 104 $ (26) $ 236
Effective tax rate (as a percent) 16.00% (5.00%) 25.00%
CERC | Net income      
Increase (decrease) in tax expense resulting from:      
State valuation allowance, net of federal income tax $ 17 $ 0 $ 0
Excess deferred income tax amortization (15) (23) (28)
Goodwill impairment     $ 30
Income tax rate reconciliation, state deferred remeasurement, net of federal income tax 45 $ 66  
Valuation allowance 17    
Louisiana and Mississippi NOL      
Increase (decrease) in tax expense resulting from:      
Total income tax expense (benefit) 12    
Louisiana and Mississippi NOL | Net income      
Increase (decrease) in tax expense resulting from:      
Equity AFUDC (17)    
Excess deferred income tax amortization (43)    
Income tax rate reconciliation, state deferred remeasurement, net of federal income tax $ 47